/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraSystemInstanceController.h
[UMaterialInterface](API\Runtime\Engine\Materials\UMaterialInterface) * GetMaterialOverride ( const [UNiagaraRendererProperties](API\Plugins\Niagara\UNiagaraRendererProperties) * InProps, int32 InMaterialSubIndex ) const